{% include "includes/auth/janrain/signIn_traditional.html" with message='It looks like you are already verified. If you still have trouble signing in, you probably need a new confirmation link email.' %}

JACKSONVILLE — It’s preseason Game 2 tonight and we’re not sure exactly how long the starters will play. Coach Joe Philbin said only that the starters will play “a hair more” than in the preseason opener against Dallas when quarterback Ryan Tannehill played 10 snaps.

Once the games count we’ll give you a game day “keys to the game.” But the preseason keys to the game are simple: build chemistry, gain experience and see which bubble players should make the team. But there are plenty of story lines right now, so here’s what to watch tonight.

Tannehill’s development: In less than a week — in the eyes of some critics — Tannehill has gone from highly hyped second-year player to a quarterback with questions. He played only 10 snaps in the preseason opener against Dallas, and the fumble charged to him on the opening play was the fault of running back Lamar Miller, but Tannehill was criticized by the national media after his brief performance. He followed it up by throwing three interceptions in practice Tuesday, although he was sharper Wednesday with a deep toss to Mike Wallace for a 40-yard touchdown. He also threw another interception on Wednesday.

Dolphins Hall of Fame quarterback Bob Griese, on a conference calls with fans on Thursday, defended Tannehill. Griese said he reads about every one of Tannehill’s practice interceptions in the newspaper but said it’s normal to throw picks in practice and that people are overreacting.

Regardless, all eyes will be on Tannehill tonight.

Is the offensive line ready? If Tannehill is inaccurate on Friday, he will get the blame. But if Tannehill doesn’t get time to throw, it will raise more concerns about the offensive line.

New left tackle Jonathan Martin has struggled at times in training camp although his time in the opener was brief. The team also had been shuffling its guards because right guard John Jerry has been out with a knee injury. Rookie Dallas Thomas struggled as the reserve left tackle against Dallas.

Jacksonville has mediocre pass rushers so Martin needs to have a strong game. If he struggles in pass protection tonight it’s a bad sign for Miami’s line. And if Thomas is not the guy to backup Martin, the Dolphins need to find somebody quickly. While it’s unclear if Martin is the answer at left tackle, it’s clear that he is the best option currently on Miami’s roster.

Is Wallace 100 percent? Receiver Mike Wallace, Miami’s big offseason acquisition, needs time to develop chemistry with Tannehill but missed the preseason scrimmage and opener because of a groin injury. He returned to practice Wednesday (the team was off Thursday) and said he expects to play against the Jaguars. Philbin would not commit to playing Wallace.

Philbin wouldn’t play Wallace in a preseason game if Wallace wasn’t healthy. But if he does play, it will still be worth watching to see if Wallace appears 100 percent. And his chemistry with Tannehill will continue to be one of the most important aspects of the preseason.

Is rookie kicker Caleb Sturgis the real deal? He was drafted in the fifth round to compete with Dan Carpenter and is considered the favorite to win the job. The team has been rotating the kickers in practice and Carpenter received all the kicks against Dallas, so it’s expected that Sturgis will kick against the Jaguars.

Philbin continues to praise Carpenter but unless Sturgis blows it in the preseason, it’s hard to envision the younger, cheaper Sturgis not winning the job.

Henne’s back!: No, Chad Henne isn’t on the Dolphins anymore. But he’s competing with Blaine Gabbert to be the No. 1 quarterback for Jacksonville. Gabbert will start but Henne will see plenty of action. The Dolphins’ defense, which looked strong against Dallas despite some tackling breakdowns, could make it a rough night for both quarterbacks. If all goes right for the Dolphins, Cameron Wake, Olivier Vernon and Dion Jordan (and perhaps Derrick Shelby?) could develop into one of the league’s best pass rushing units.

Receiver bubble watch: Eight receivers (and the injured Rishard Matthews) are fighting for two likely spots on the Dolphins roster.

So here’s the debut of the receiver bubble watch that I will update throughout the preseason. My current projections heading into the second preseason game:

1. Chad Bumphis: Before the Dallas game, Marvin McNutt was the top guy. But there are some concerns with McNutt’s consistency and Bumphis seems to be getting better all the time. Bumphis, an undrafted rookie out of Missisippi State, isn’t exceptionally fast or tall. But he gets open and makes catches. Former Dolphins great Nat Moore is a believer, raving about Bumphis on a conference call with fans on Thursday. Moore is a guy who likes consistency out of receivers, and aside from his failure to hold on to the ball against Dallas that resulted in a pick 6, Bumphis has been the most consistent of the bunch in recent practices.

2. Marvin McNutt: We’ll keep McNutt in the No. 2 spot for now but he’s struggled of late. With Wallace and Hartline out against Dallas, McNutt started opposite Brandon Gibson. McNutt had trouble holding on to passes — a problem he’s had in practices as well recently — and did not have a reception in the game. McNutt has size and strength but if he can’t hold on to the ball he will be of no use to the Dolphins because he’s not going to hurt you with his quickness. McNutt needs to reestablish himself quickly or he might find himself behind someone he knows well.

3. Keenan Davis: He just joined the team last week and was college teammates with McNutt at Iowa. Davis was seen as the longest of long shots when he arrived but he is suddenly creating all sorts of buzz in camp. Davis had three receptions and a touchdown against Dallas and coaches have been talking about Davis as a real contender. Davis runs only a 4.65 in the 40, but he’s 6-2 218. With the loss of Armon Binns, the Dolphins could use a receiver with decent size and strength.

T-4. Brian Tyms/Jeff Fuller: Tyms and Fuller, who both played on the Dolphins’ practice squad last year, have been equally OK in camp. They’ve made catches at times but not consistently and neither have stood out like Bumphis, McNutt or Davis. Fuller in particular has the size to make it in the NFL, but he’s not establishing himself. Tyms and Fuller both need to do more to propel themselves into the conversation.

6. Julius Pruitt: If Pruitt makes the team again it will be because the team likes his special teams ability. Pruitt was a special teams standout in his first go-round with the Dolphins, but he hasn’t stood out as a receiver since rejoining Miami last week.